Anji High Back Ergonomic Mesh Office Chair with Padded Fabric Ajustable Seat, Tilt Tension, Headrest, Arms, Computer Desk Chair, Grey High Back Executive Mesh Office Chair with Headrest and Armrest Fabric and Mesh Back Material , Pneumatic Seat Height Adjustment Pneumatic seat-height adjustment; 360-degree swivel; smooth-rolling casters Overall size:L24.8*W24.4*H46.5-50.4 inches ,Seat height:18.9inch Lowest-22.8inch Hightest CA117 Fire Retardant Foam,1-year limited warranty.